Volume 1 Issue 1
Study of The Mechanical Strength and Leaching Behavior of Phosphogypsum in a Sulfur in Matrix
Mohamed CHOURA*, Mayssoun KESKES, Fethi CHERIF, Jamel ROUIS
This work suggests a treatment alternative to phosphogypsum, an industrial solid waste generated by the Tunisian Chemical Group in huge amounts, by sulfur waste from a natural gas purification plant in Tunisia, contaminated with heavy metals and mercury, used as a binder. Mixtures with different phosphogypsum contents were made at a temperature equal to 150°C and compacted at the paste phase with a pressure of 1.5 MPa. The mechanical strength and leaching behavior results were sought after a period of one month and then with an artificial ageing cycle of thermal shocks and humidity variation.
Effect of Organic Loading and DO on Stability of Hypersaline Aerobic Granular Sludge
Miaomiao Dong*, CHEN Yao, HUANG Peng-cheng, ZHANG Zhi-min, YU Gang
In order to investigate the effect of organic loading and dissolved oxygen (DO) on the characteristics of hypersaline aerobic granular sludge in some sequencing batch reactors (SBR), the indicators of sludge were analyzed such as the sludge volume index (SVI), minimal sedimentation rate, dehydrogenase activity, extracellular polymeric substances (EPS) component and size distribution of granule. Results indicate that the effect of organic loading and DO on the stability of aerobic granular sludge is significant. The organic loading which is over low or over high does not go against the stability of granular sludge.
Distribution of Acid-Extractable Pb Contents in Molten Slag From Municipal Solid Waste Incineration Ash
Satoshi Mizutani*, Yoshinori Kanjo
In Japan, when molten slag from municipal solid waste incineration ash is used in the general environment, acid-extractable Pb contents must be lower than utilization criteria, as determined by JIS (Japanese Industrial Standard) K 0058-2 method. However, representativeness of 1,000 t of slag samples in practical usage is ineffective because only 6 g of samples are used for testing under such standards. This study has three aims: 1. to determine the variation of acid-extractable Pb contents in the 20 slag samples from one plant, 2.
Assessment of Cement Durability in Repository Environment
Eduardo G.A. Ferreira*, Roberto Vicente, Xabier Turrillas, Fabiano Yokaichiya, Margareth K.K.D. Franco, Luis G. Martinez, Júlio T. Marumo
Portland cement paste is proposed as the material to filling in the annulus between the casing of a borehole and the geological formation in a deep repository for spent sealed radiation sources in Brazil. The cement paste is intended to function as structural material, an additional barrier against the migration of radionuclides outside the repository, and as a blockage against the transport of water between the different strata of the geological setting. The objective of this research is to investigate the behavior of the cement paste and to estimate its service life.
Thermo and pH-Responsive Polymers and Adsorbents for Separation Purposes
Betül Taşdelen*, Deniz İzlen Çifçi, Süreyya Meriç
Environmental pollution remains one of the major problems both on the national and international level. One of the most severe problems with respect is the presence of toxic substances such as heavy metal ions, anions in the industrial wastewaters. Heavy metals such as lead, cadmium and copper, and different types of dyes in wastewater are known to pose risks to environment and human. Various conventional techniques and advanced oxidation processes have been used for the removal of dyes from wastewater. There is a huge need for developing new, effective and cost-efficient technologies for removal of pollutants from wastewaters.
Factor analysis to assess pollutant source apportionment and to investigate the relationship between catchment attributes and instream water quality
The EU Water Framework Directive (WFD EC60/2000) requires that quality-flow compliance at a particular surface-water reach entail consideration of all upstream inputs, including contaminated land and groundwater contributions. Multivariate statistical techniques may improve our understanding of the pollutant sources affecting river quality. Aim of this study is to analyze the source apportionment and the groundwater contribution to the total pollutant load of Mella river. Factor Analysis (FA) was applied to a series of water quality measurements at seven monitoring sites, located upstream, in the middle and downstream the groundwater recharge area of the Mella river watershed.
Environmental Risk Assessment of 20 Human Use Antibiotics in Surface Water and Urban Wastewater
Süreyya Meriç*, Füsun Ekmekyapar, Gamze Varol
Antibiotic consumption has received a lot of attention in the media in the last several years due to the increasing numbers of diseases and infections becoming resistant to traditional treatments for both humans and animals. Because they are excreted unchanged via urine and/or feces into domestic sewage, and consequently discharged to receiving waters in the effluents of urban wastewater treatment plants (UWTPs). Most of antibiotics are also associated to multidrug resistance in bacteria. The absence of full environmental fate and effect data of antibiotics inhibits an effective assessment of the potential risk through environmental pathways.